"""
Case Type   : 多块预读
Case Name   : shared_buffer 8M用尽后，开启多块预读，全表扫描
Create At   : 2024/12/05
Owner       : @li-xin12345
Description :
    1、建表，重启
    2、扫描表1
    3、开启预读块 16，扫描表2
    4、查看日志中打印的预读块数量
    5、清理环境
Expect      :
    1、成功
    2、成功
    3、预读了设置的块数量
    4、成功
    5、成功
History     :
"""
import os
import unittest

from yat.test import Node
from yat.test import macro

from testcase.utils.Common import Common
from testcase.utils.CommonSH import CommonSH
from testcase.utils.Constant import Constant
from testcase.utils.Logger import Logger


class SessionTest(unittest.TestCase):
    def setUp(self):
        self.log = Logger()
        self.log.info(f'-----{os.path.basename(__file__)} start-----')
        self.constant = Constant()
        self.common = Common()
        self.pri_sh = CommonSH('PrimaryDbUser')
        self.pri_user_node = Node('PrimaryDbUser')
        self.tb_name = 't_multi_bulk_read_0017'
        self.pg_log = \
            os.path.join(macro.PG_LOG_PATH, macro.DN_NODE_NAME.split('/')[0])
        self.shared_buffer_default = self.common.show_param('shared_buffers')

    def test_multi_bulk_read(self):
        text = '----step1: 建表，重启；expect: 成功----'
        self.log.info(text)
        sql = f'''drop table if exists {self.tb_name}_1, 
        {self.tb_name}_2 cascade;
        create table {self.tb_name}_1 (
            c_int int,
            c_char char(25),
            c_bool bool default false
        );
        insert into {self.tb_name}_1
        values (generate_series(1, 10000000), 
        'char'||generate_series(1, 10000000));
        create table {self.tb_name}_2 (
            c_int int,
            c_char char(25),
            c_bool bool default false
        );
        insert into {self.tb_name}_2
        values (generate_series(1, 1000000), 
        'char'||generate_series(1, 1000000));
        '''
        res = self.pri_sh.execut_db_sql(sql)
        self.log.info(res)
        self.assertIn(self.constant.DROP_TABLE_SUCCESS, res, f'执行失败：{text}')
        self.assertEqual(res.count(self.constant.CREATE_TABLE_SUCCESS), 2,
                         f'执行失败：{text}')
        self.assertIn('INSERT 0 10000000', res, f'执行失败：{text}')
        self.assertEqual(res.count('INSERT 0 1000000'), 2, f'执行失败：{text}')

        self.log.info('--修改参数--')
        res = self.pri_sh.execute_gsguc(
            'set', self.constant.GSGUC_SUCCESS_MSG, "shared_buffers='8MB'")
        self.log.info(res)
        self.assertTrue(res, f'执行失败：{text}')

        msg = self.pri_sh.restart_db_cluster()
        self.log.info(msg)
        status = self.pri_sh.get_db_cluster_status()
        self.assertTrue("Degraded" in status or "Normal" in status)

        text = '----step2: 扫描表1；expect: 成功----'
        self.log.info(text)
        sql = f"select count(*) from {self.tb_name}_1;"
        res = self.pri_sh.execut_db_sql(sql)
        self.log.info(res)
        self.assertIn('10000000', res, f'执行失败：{text}')

        text = '----step3: 开启预读块 16，扫描表2；expect: 成功----'
        self.log.info(text)
        sql = f"set heap_bulk_read_size = 16;" \
              f"select count(*) from {self.tb_name}_2;"
        res = self.pri_sh.execut_db_sql(sql)
        self.log.info(res)
        self.assertIn(self.constant.SET_SUCCESS_MSG, res, f'执行失败：{text}')
        self.assertIn('1000000', res, f'执行失败：{text}')

        text = '----step4: 查看日志中打印的预读块数量；expect: 成功----'
        self.log.info(text)
        cmd = f"cd {self.pg_log};" \
              f"ls -t | head -1 | awk '{{{{print $1}}}}' | " \
              f"xargs cat | tail -30 | " \
              f"grep 'End of pre-Read, the max blocks batch is'"
        self.log.info(cmd)
        res = self.common.get_sh_result(self.pri_user_node, cmd)
        self.log.info(res)
        self.assertIsNotNone(res, f'执行失败：{text}')

    def tearDown(self):
        text = '----step5: 清理环境;expect:成功----'
        self.log.info(text)
        sql = f"drop table if exists {self.tb_name}_1, " \
              f"{self.tb_name}_2 cascade;"
        res = self.pri_sh.execut_db_sql(sql)
        self.log.info(res)

        shared_buffer_res = self.pri_sh.execute_gsguc(
            'set', self.constant.GSGUC_SUCCESS_MSG,
            f'shared_buffers={self.shared_buffer_default}')
        self.log.info(shared_buffer_res)
        restart_res = self.pri_sh.restart_db_cluster()
        self.log.info(restart_res)

        self.assertIn(self.constant.DROP_TABLE_SUCCESS, res, f'执行失败：{text}')
        self.assertTrue(shared_buffer_res, f'执行失败：{text}')
        self.assertTrue(restart_res)
        self.log.info(f'-----{os.path.basename(__file__)} end-----')
